package sg.atom.utils.datastructure.tree.htree;import java.io.Serializable;/** * * Abstract class for Hashtable directory nodes * * * * @author <a href="mailto:boisvert@intalio.com">Alex Boisvert</a> * * @version $Id: HashNode.java,v 1.2 2003/03/21 02:54:58 boisvert Exp $ * */public class HashNode implements Serializable {    // Empty, there's no common functionality.  We use this abstract    // class for typing only.}